How long can you leave the pre heat on? I live in Canada and the temperature is set to dip to minus 25. I want to leave it on to keep the engine warm and assure starting on Christmas day for a departure south.
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Do you mean the plug in 110V block heater?
If so you only need it on for about an hour to get the engine plenty warm for a easy start.
Years ago Ny tow truck was plugged in on a timer with a hour on,hour off,hour on,.... it started easy at any time. I was just saving money on the 600 watt usage.
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(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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Rated for full time use so you can switch it on the day before if you want. That gives you a chance to make sure it is working.
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Tony Lee - International Grey Nomad. Picasa Album - Travel Map RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
According to the owners manual for my Fleetwood w/Cat engine the colder it is outside the longer you should plug it in. At -25 degrees 6-8 hours would be plenty. The manual also says it doesn't hurt to leave it on all day/night. I'd plug it in the evening before you plan on leaving which is what I'm doing tonight for tomorrows departure.
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